PARIS :Britain said it would invest 250 million pounds ($340 million) in technology to make air travel greener, backing research into zero-emission flying, laser-beam manufacturing and cutting aircraft drag, to help boost the country's aerospace industry. Britain said the funding for research and development projects led by Airbus, Rolls-Royce and a number of smaller companies and academic partnerships, would attract more private investment into the sector and add new jobs. Industry Minister